Overall Green alert Flood
in Japan

Flood impact summary

This flood is expected to have a low humanitarian impact based on the magnitude and the affected population and their vulnerability.

GDACS ID: 1101985
Deaths: 0
Displaced: 1411
Region: Itami City Museum of Art, Okaya City Office, Nakatsugawa City Hall
Countries: Japan
From - To 07 May - 09 May
Known identifiers for this event:

GDACS Score

For more info on GDACS alert score click here.

Impact Assessement as of 08-05-2023

SENDAI Indicator B N Country Location Info
displaced 73 Japan Itami City Museum of Art
displaced 71 Japan Okaya City Office
displaced 1267 Japan Nakatsugawa City Hall
SENDAI Indicator C N Country Location Info
houses 10 Japan Itami City

Satellite Observation

Satellite-based Flood extent provided by GLOFAS
Overall of the satellite-based flooded area from / to : 2023-04-30 / 2023-05-16  

Sunday 30/04Monday 01/05Tuesday 02/05Wednesday 03/05Thursday 04/05Friday 05/05Saturday 06/05Sunday 07/05Monday 08/05Tuesday 09/05Wednesday 10/05Thursday 11/05Friday 12/05Saturday 13/05Sunday 14/05Monday 15/05Tuesday 16/05

Timeline of revisions

For accessing reports of previous advisories, please click on the advisory number in the table below.

IDAlert ColorPopulation affectedStart DateEnd DateSource
1 0 deaths and 1411 displaced 07 May 2023 09 May 2023 GLOFAS

Flood polygons

This polygon (translucent blue with a blue border) is drawn by the analysts recording the flood event. It is meant to include all the areas reported as affected, by official source or the media. It does not represent the area actually under water.

Microwave flood detection

Flooded area, as detected in microwaves by the Global Flood Detection System of the JRC, based on NASA TRMM/GPM observations. This system has a rather low resolution (of 5-10km) but is not affected by clouds.
For more details, see http://www.unisdr.org/files/9622_LBNA23303ENC002.pdf.
The areas with a flood signal along the coast are an artefact of the system and should not be considered.

Optical Flood detection

Flooded area as detected in optical wavelengths by NASA/MODIS, known as "MODIS Flood Product". Data are made available by NASA GSFC Flood Mapping Project, http://oas.gsfc.nasa.gov/floodmap/index.html. Resolution of 250m, heavily affected by cloud cover.